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iwlwifi: new debugging feature for dumping data traffic

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The traffic buffer will only beallocated and used if either bit 23
(IWL_DX_TX) or bit 24 (IWL_DL_RX) of "debug" is set;
example: "debug=0x800000" - log tx data traffic
         "debug=0x1000000" - log rx data traffic
         "debug=0x1800000" - log both tx and rx traffic

The traffic log will store the beginning portion (64 bytes)  of the
latest 256 of tx and rx packets in the round-robbin buffer for
debugging,
user can examine the log through debugfs file.

How to display the current logged tx/rx traffic and txfifo and rxfifo
read/write point:
"cat traffic_log" in /sys/kernel/debug/ieee80211/phy0/iwlagn/debug
directory

By echo "0" to traffic_log file will empty the traffic log buffer and
reset both tx and rx taffic log index to 0.

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Wey-Yi Guy
2009-08-07 15:41:39 -07:00
committed by John W. Linville
parent 7aafef1c6e
commit 20594eb0da
10 changed files with 262 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

102
drivers/net/wireless/iwlwifi/iwl-debugfs.c
View File

@@ -712,6 +712,104 @@ DEBUGFS_READ_FILE_OPS(led);
DEBUGFS_READ_FILE_OPS(thermal_throttling);
DEBUGFS_READ_WRITE_FILE_OPS(disable_ht40);
static ssize_t iwl_dbgfs_traffic_log_read(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
struct iwl_priv *priv = file->private_data;
int pos = 0, ofs = 0;
int cnt = 0, entry;
struct iwl_tx_queue *txq;
struct iwl_queue *q;
struct iwl_rx_queue *rxq = &priv->rxq;
char *buf;
int bufsz = ((IWL_TRAFFIC_ENTRIES * IWL_TRAFFIC_ENTRY_SIZE * 64) * 2) +
(IWL_MAX_NUM_QUEUES * 32 * 8) + 400;
const u8 *ptr;
ssize_t ret;
buf = kzalloc(bufsz, GFP_KERNEL);
if (!buf) {
IWL_ERR(priv, "Can not allocate buffer\n");
return -ENOMEM;
}
pos += scnprintf(buf + pos, bufsz - pos, "Tx Queue\n");
for (cnt = 0; cnt < priv->hw_params.max_txq_num; cnt++) {
txq = &priv->txq[cnt];
q = &txq->q;
pos += scnprintf(buf + pos, bufsz - pos,
"q[%d]: read_ptr: %u, write_ptr: %u\n",
cnt, q->read_ptr, q->write_ptr);
}
if (priv->tx_traffic && (iwl_debug_level & IWL_DL_TX)) {
ptr = priv->tx_traffic;
pos += scnprintf(buf + pos, bufsz - pos,
"Tx Traffic idx: %u\n", priv->tx_traffic_idx);
for (cnt = 0, ofs = 0; cnt < IWL_TRAFFIC_ENTRIES; cnt++) {
for (entry = 0; entry < IWL_TRAFFIC_ENTRY_SIZE / 16;
entry++, ofs += 16) {
pos += scnprintf(buf + pos, bufsz - pos,
"0x%.4x ", ofs);
hex_dump_to_buffer(ptr + ofs, 16, 16, 2,
buf + pos, bufsz - pos, 0);
pos += strlen(buf);
if (bufsz - pos > 0)
buf[pos++] = '\n';
}
}
}
pos += scnprintf(buf + pos, bufsz - pos, "Rx Queue\n");
pos += scnprintf(buf + pos, bufsz - pos,
"read: %u, write: %u\n",
rxq->read, rxq->write);
if (priv->rx_traffic && (iwl_debug_level & IWL_DL_RX)) {
ptr = priv->rx_traffic;
pos += scnprintf(buf + pos, bufsz - pos,
"Rx Traffic idx: %u\n", priv->rx_traffic_idx);
for (cnt = 0, ofs = 0; cnt < IWL_TRAFFIC_ENTRIES; cnt++) {
for (entry = 0; entry < IWL_TRAFFIC_ENTRY_SIZE / 16;
entry++, ofs += 16) {
pos += scnprintf(buf + pos, bufsz - pos,
"0x%.4x ", ofs);
hex_dump_to_buffer(ptr + ofs, 16, 16, 2,
buf + pos, bufsz - pos, 0);
pos += strlen(buf);
if (bufsz - pos > 0)
buf[pos++] = '\n';
}
}
}
ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
kfree(buf);
return ret;
}
static ssize_t iwl_dbgfs_traffic_log_write(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct iwl_priv *priv = file->private_data;
char buf[8];
int buf_size;
int traffic_log;
memset(buf, 0, sizeof(buf));
buf_size = min(count, sizeof(buf) - 1);
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (sscanf(buf, "%d", &traffic_log) != 1)
return -EFAULT;
if (traffic_log == 0)
iwl_reset_traffic_log(priv);
return count;
}
DEBUGFS_READ_WRITE_FILE_OPS(traffic_log);
/*
* Create the debugfs files and directories
*
@@ -738,6 +836,7 @@ int iwl_dbgfs_register(struct iwl_priv *priv, const char *name)
DEBUGFS_ADD_DIR(data, dbgfs->dir_drv);
DEBUGFS_ADD_DIR(rf, dbgfs->dir_drv);
DEBUGFS_ADD_DIR(debug, dbgfs->dir_drv);
DEBUGFS_ADD_FILE(nvm, data);
DEBUGFS_ADD_FILE(sram, data);
DEBUGFS_ADD_FILE(log_event, data);
@@ -753,6 +852,7 @@ int iwl_dbgfs_register(struct iwl_priv *priv, const char *name)
#endif
DEBUGFS_ADD_FILE(thermal_throttling, data);
DEBUGFS_ADD_FILE(disable_ht40, data);
DEBUGFS_ADD_FILE(traffic_log, debug);
DEBUGFS_ADD_BOOL(disable_sensitivity, rf, &priv->disable_sens_cal);
DEBUGFS_ADD_BOOL(disable_chain_noise, rf,
&priv->disable_chain_noise_cal);
@@ -794,6 +894,8 @@ void iwl_dbgfs_unregister(struct iwl_priv *priv)
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_thermal_throttling);
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_disable_ht40);
DEBUGFS_REMOVE(priv->dbgfs->dir_data);
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_debug_files.file_traffic_log);
DEBUGFS_REMOVE(priv->dbgfs->dir_debug);
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_rf_files.file_disable_sensitivity);
DEBUGFS_REMOVE(priv->dbgfs->dbgfs_rf_files.file_disable_chain_noise);
if (((priv->hw_rev & CSR_HW_REV_TYPE_MSK) == CSR_HW_REV_TYPE_4965) ||